Inflatable rat marching in Michigan
Since construction unions operate apprenticeship programs that train skilled workers, the value proposition is extremely direct, and many construction contractors are enthusiastic about unions for that reason. But, in the words of Frederick Douglass, "Power concedes nothing without a demand. It never did and it never will," and at a certain point "partnering with owners" could start to mean not making enough of a demand for power to concede anything.
Not that you need an inflatable rat to make a demand. You just need the will to fight that it has represented.